| 摘要 |
An indicator for detecting the sufficiency or insufficiency of oil level in the sump of a vehicle engine, wherein detection is dependent upon the creation of a vacuum between a ball valve device within the engine and an external vacuum source. If the oil level is sufficient, operation of the vacuum source causes the ball to close the valve device whereby the required vacuum is created and detected. If the oil level is insufficient, the valve device remains open, even if the vacuum source is operated (that is, the ball stays off its valve seat) so that the required vacuum is not created and this fact can be detected upon operation of the vacuum source.
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